Perhaps you should try some spelling variations:
nganh chung » nhanh chuong, nganh cong, nhanh chong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nganh » hoc nhanh
chung hoc » trung hoc, dung hoc, hung hoa
ban thanh » ban hang
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
ban hanh » ban hang
te sach » toc sach
va do » va dao, va doc, va co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc tap, nghien thu cong hoc nganh chung hoc va do ((ban thanh) OR (ban hanh)) toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien thu cong hoc nganh chung hoc va do ((ban thanh) OR (ban hanh)) toan".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien thu cong hoc nganh chung hoc va do ((ban thanh) OR (ban hanh)) toan*.